Help fixing surface borders and internal edges

I am editing a model I downloaded. It used to be a yacht and I am reducing it the hull only. I can’t seem to close up the “holes” where the windows were. I ran surface inspector (first time ever) and have a ton surface borders and internal edges. Can someone please help / explain what I need to do here. Thanks.
Hull 2.skp (2.2 MB)

You need to erase the unwanted lines and draw the lines that complete the surface.

I had fun with your model, I fixed a lot of thing some parts I remodeled, since it´s symmetrical I modeled just one half and created a component, all the geometry is made out of quads now, I made some copies so you can choose the one you like the most.

Hull 2.skp (845.2 KB)

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That is really helpful to see how you did that. I was going about it the wrong way. Thank you very much.

Wow. That is amazing. I can’t thank you enough. I have a lot to learn, but am loving this.